Granted Patent
Utility
US 4,672,398 · App. 06/793,241
Ink droplet expelling apparatus
Inventors:
Tadashi Kuwabara, Yasumasa Matsuda, Masatoshi Kasahara, Kyoji Mukumoto, Kazuyoshi Tokunaga
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: Oct 31, 1985
Inventors
Tadashi Kuwabara
Yasumasa Matsuda
Masatoshi Kasahara
Kyoji Mukumoto
Kazuyoshi Tokunaga
Assignees (at issue)
HITACHI, LTD.
Hitachi Koki Co., Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.